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Effect of inoculation with PS01 on the expression levels of genes involved in tryptophan and auxin biosynthesis in Arabidopsis. RT-qPCR analyses of gene expression have been performed separately on root (a,b) and shoot (c,d) at 24 and 48 h after inoculation, as indicated. The bars presented are the mean expression levels ± SD (n = 3). Gene expression was normalized to Actin (At3 g18780) expression level. Asterisks indicate significant differences (Student’s t test; p < 0.05).
